1ZMS

LMP1 Protein binds to TRAF3 as a structural CD40

1ZMS の概要

• エントリーDOI: 10.2210/pdb1zms/pdb
• 分子名称: TNF receptor associated factor 3, Latent membrane protein 1 (2 entities in total)
• 機能のキーワード: cd40, nf-kb signaling, lmp1, tnf receptor, traf3, signaling protein
• 由来する生物種: Homo sapiens (human); 詳細
• 細胞内の位置: Cytoplasm (Probable): Q13114; Host cell membrane; Multi-pass membrane protein (By similarity): P13198
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 22745.03

構造登録者

Wu, S.D.,Xie, P.,Welsh, K.,Li, C.,Ni, C.-Z.,Zhu, X.,Reed, J.C.,Satterthwait, A.C.,Bishop, G.A.,Ely, K.R. (登録日: 2005-05-10, 公開日: 2005-07-19, 最終更新日: 2024-02-14)

主引用文献

Wu, S.D.,Xie, P.,Welsh, K.,Li, C.,Ni, C.-Z.,Zhu, X.,Reed, J.C.,Satterthwait, A.C.,Bishop, G.A.,Ely, K.R.
LMP1 protein from the Epstein Barr virus is a structural CD40 decoy in B lymphocytes fro binding to TRAF3
J.Biol.Chem., 39:33620-33626, 2005

PubMed Abstract: Epstein-Barr virus is a human herpesvirus that causes infectious mononucleosis and lymphoproliferative malignancies. LMP1 (latent membrane protein-1), which is encoded by this virus and which is essential for transformation of B lymphocytes, acts as a constitutively active mimic of the tumor necrosis factor receptor (TNFR) CD40. LMP1 is an integral membrane protein containing six transmembrane segments and a cytoplasmic domain at the C terminus that binds to intracellular TNFR-associated factors (TRAFs). TRAFs are intracellular co-inducers of downstream signaling from CD40 and other TNFRs, and TRAF3 is required for activation of B lymphocytes by LMP1. Cytoplasmic C-terminal activation region 1 of LMP1 bears a motif (PQQAT) that conforms to the TRAF recognition motif PVQET in CD40. In this study, we report the crystal structure of this portion of LMP1 C-terminal activation region-1 (204PQQATDD210) bound in complex with TRAF3. The PQQAT motif is bound in the same binding crevice on TRAF3 where CD40 is bound, providing a molecular mechanism for LMP1 to act as a CD40 decoy for TRAF3. The LMP1 motif is presented in the TRAF3 crevice as a close structural mimic of the PVQET motif in CD40, and the intermolecular contacts are similar. However, the viral protein makes a unique contact: a hydrogen bond network formed between Asp210 in LMP1 and Tyr395 and Arg393 in TRAF3. This intermolecular contact is not made in the CD40-TRAF3 complex. The additional hydrogen bonds may stabilize the complex and strengthen the binding to permit LMP1 to compete with CD40 for binding to the TRAF3 crevice, influencing downstream signaling to B lymphocytes and contributing to dysregulated signaling by LMP1.

PubMed: 16009714
DOI: 10.1074/jbc.M502511200

実験手法

X-RAY DIFFRACTION (2.8 Å)